In my opinion, it is impossible to create characters until one has spent a long time in studying men, as it is impossible to speak a language until it has been seriously acquired. Not being old enough to invent, I content myself with narrating, and I beg the reader to assure himself of the truth of a story in which all the characters, with the exception of the heroine, are still alive. Eye-witnesses of the greater part of the facts which I have collected are to be found in Paris, and I might call upon them to confirm me if my testimony is not enough. And, thanks to a particular circumstance, I alone can write these things, for I alone am able to give the final details, without which it would have been impossible to make the story at once interesting and complete.